Piston-packing



(No Model.)

W. W. ST. JOHN.

PISTON PACKING. 4

Patented Apr. 17,1883.

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UNITED STATES PATEN I Erica.

PISTON-PACKING.

SPECIFICATION forming part of Letters Patent No. 275,955, dated April17, 1883.

Application filed August 518, 1882. (No model.)

To all whom it may concern Be it known that I, WILLIAM W. ST. JOHN, acitizen of the United States, residing at St. Louis, in the county ofSt. Louis and State of Missouri, have invented certain new and use fulImprovements in Piston-Packing; and I do hereby declare the following tobe a full, clear, and exact description of the invention, such as willenable others skilled in the art to which it appertains to make and usethe same.

My invention relates to improvements in piston-packing; and the objectis to produce a more perfect and economical piston-packin g, by whichleakage of steam in the cylinder is prevented, while at the same timethe piston can be readily centered and will wear evenly on its entirecircumference.

The invention consists in a packing-ring of angular shape, with theflanged part made much wider or deeper than'the annular projecting face,so that it can wear off entirely before the flange can leave its recessin the pistonhead.

It also consists in a packing-piece having a tongue, which fits into agroove in the side of the packing-ring, whilea projecting pin enters arecess in the ring,-so that the ring and packing-piece must all movetogether, and thus prevent the main ring from slipping around on thepiston, so as to expose the joint, all of which will be more fullydescribed hereinafter, reference being had to the accompanying drawingsand the letters of reference marked thereon.

Like letters refer to like parts in the different figures of thedrawings, in which- Figure 1 represents a side elevation with thefollower and packing-ring removed, and showing the packing -piece. Fig.2 is a vertical cross-section of the same. Fig. 3 is a side view andsection of the packing-ring. Fig. et is a side view and end view of thepacking -piece. Fig. 5 is a modification of the piston.

In the drawings, A represents the pistonhead, which can be made solidfor small pistons, or with arms, in the ordinary manner, and thefollower A may be screwed onto the hub of the piston-head, or secured bybolts tapped into the holes a. The ordinary bullring B is provided witha centering-ring, O, which can be adjusted by bolts 0 in the cylinder.On each end of the bull-rin g is arranged a packing-ring, D D, which isof angular shape. In the side of the ring is a groove, (7. and thevertical part d is made deeper than the annular or flange part d, sothat this part can wear off entirely before the part (1 will leave itsplace. The rings are cut as shown at h, Fig. 3, and into this cut apacking-piece, Edits. This packing-piece has a tongue, 6, that fits intothe groove (1, while a projection or pin,f, enters the part b of the cutI), so that when the rings are forced out by the steam thepacking-pieces must follow with them, while at the same time the mainring is prevented from slipping around on the piston so as to exposethejoint, and thus all leakage of steam is prevented. I prefer to placethe packing-pieces at the upper side of the piston, so that the weightthereot'cannot compress the packing-ring, which it will do when the cutis at the lower side. The angular ring might be made with its verticalside less in depth or equal to the thickness of the radial flange,although I prefer to make it of greater depth. I also prefer to make thering deeper than it is on its face, so that the steam will force itagainst the face of the bull-ring, thus giving it a greater area for thesteam to act on, and pre venting the steam from forcing it back from theface of the cylinder.

In adapting this packing to old pistons I arrange it as shown in themodification shown in Fig. 5. The packingpiece E is in this instanceinserted into a recess in the bull-ringB, with the pin flitting into theslot b in the packing-ring D to prevent it from turning.

Having thus described my invention, what I claim, and desire to secureby Letters Patent,

1. In a piston, a packing-ring of angular shape, having the verticalpart made of greater depth than the annular flange, and having a groovein its side, in which a packing-piece with tongue fits, substantially asspecified.

2. In a piston, a packing-ring of angular shape, having part (1 ofgreater depth than flange d, and a groove, (Z, in combination with apacking-piece, E, provided with tongue 0 and projection or pin f, asshown, and for the purpose set forth.

3. In a piston, the combination of a packing ring of angular shape,having the vertical part (1 made deeper than the annuiar flange d, and.packing-piece E, provided with tongue 0 and provided with a groove, d,with a packingprojectionorpinf,allsubstantially as specified. 10

piece, E, having tongue 0 and projectionsf, fit- In testimony WhereofIaffix my signature in ting into the cntb b,substantial1y as described.presence of two witnesses.

4. A piston consisting of the head A, hull- WILLIAM WV. ST. JOHN. ringB, packing ring 0, packing rings D D, Witnesses: having groove 61 andpart (1 made deeper than A. '1. SANGSTON, flange d, and cut I) b, incombination with the LLOYD F. KELEHER.

